On Aug. 19, 2012, the family of Deanna Cook found her body two days after she called 911 to report that her former husband was attacking her. The call-taker that received the call was suspended and later resigned. The operator who took a call from Cook's family shortly before they broke into her house and found her body was working an overtime shift and was later fired. She blamed poor city training and procedures.

He told the Dallas City Council Public Safety Committee on Monday that staffing was a problem last summer because there were too few 911 operators -- just 64 last August with an authorized staff of 92.

"You started having, basically, overtime fatigue," he said. "There was overtime available, but people didn't want to sign up for it anymore; particularly their Friday and Saturday nights, which were some of the places where you needed it the most."